Connecting parking sensor and underfoot LED light

I bought 206 ma parking sensor and underfoot led, I don't know which cable to get the parking sensor from the rear lamp. I also want the led to light up when the door is opened, from where and from which cable should I get power?

you will get the parking sensor from the reversing light bro. To identify it, you can find the socket socket corresponding to the lamp on the rear socket. When you get the plus, you will make the minus connection. You can get the underfoot led connection from the ceiling lamp.